Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 193gr | Peregrine VLR-4 bullet and 72 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Winchester StaBALL HD.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 58,624 psi | 90% | 2772 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,172 psi | 85% | 2743 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 57,812 psi | 89% | 2877 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 88% | 56,652 psi | 87% | 2812 fps | 100% |
| ADI AR 2213 | <<locked>> | 92% | 58,784 psi | 90% | 2877 fps | 99.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,029 psi | 88% | 2844 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 49,559 psi | 76% | 2808 fps | 96.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,242 psi | 79% | 2805 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,739 psi | 87% | 2802 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,086 psi | 86% | 2799 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,027 psi | 85% | 2815 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,579 psi | 87% | 2779 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,608 psi | 87% | 2844 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,334 psi | 88% | 2864 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,331 psi | 84% | 2864 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,912 psi | 86% | 2782 fps | 97.9% |
| Bofors RP15 | <<locked>> | 94% | 58,030 psi | 89% | 2858 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 56,376 psi | 87% | 2854 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 55,027 psi | 85% | 2815 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 56,913 psi | 88% | 2749 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 58,711 psi | 90% | 2867 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 57,087 psi | 88% | 2802 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 58,073 psi | 89% | 2812 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,956 psi | 88% | 2799 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 56,753 psi | 87% | 2723 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,448 psi | 85% | 2920 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 58,015 psi | 89% | 2835 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,260 psi | 57% | 1778 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,448 psi | 85% | 2736 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 58,436 psi | 90% | 2769 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 55,680 psi | 86% | 2736 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 58,610 psi | 90% | 2792 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 92% | 56,927 psi | 88% | 2861 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,644 psi | 72% | 2720 fps | 98.8% |
| Lovex S065 | <<locked>> | 82% | 55,680 psi | 86% | 2717 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,508 psi | 89% | 2762 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,173 psi | 86% | 2740 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,753 psi | 87% | 2792 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 47,297 psi | 73% | 2743 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 54,911 psi | 85% | 2828 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,392 psi | 88% | 2779 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 58,175 psi | 90% | 2881 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 84% | 56,536 psi | 87% | 2789 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,347 psi | 87% | 2805 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,159 psi | 59% | 1821 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 55,709 psi | 86% | 2766 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 58,334 psi | 90% | 2848 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,521 psi | 87% | 2913 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,869 psi | 86% | 2877 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 88% | 57,334 psi | 88% | 2782 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 88% | 55,651 psi | 86% | 2789 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 56,913 psi | 88% | 2749 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,680 psi | 86% | 2717 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,508 psi | 89% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 58,320 psi | 90% | 2720 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,288 psi | 85% | 2785 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 55,100 psi | 85% | 2717 fps | 99.2% |
| Somchem S365 | <<locked>> | 86% | 58,697 psi | 90% | 2779 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,101 psi | 86% | 2762 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 55,274 psi | 85% | 2720 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 55,999 psi | 86% | 2746 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 54,911 psi | 85% | 2753 fps | 96% |
| Vihtavuori N550 | <<locked>> | 84% | 58,392 psi | 90% | 2776 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 58,392 psi | 90% | 2802 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 58,595 psi | 90% | 2887 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 94% | 55,100 psi | 85% | 2815 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 98% | 56,347 psi | 87% | 2877 fps | 99% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 57,493 psi | 88% | 2933 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 54,911 psi | 85% | 2674 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,087 psi | 88% | 2802 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 55,956 psi | 86% | 2861 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,999 psi | 86% | 2756 fps | 99.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 38,667 psi | 60% | 2461 fps | 99.4% |
| Accurate 4350 | <<locked>> | 80% | 51,605 psi | 79% | 2694 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 40,132 psi | 62% | 2572 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 80% | 43,047 psi | 66% | 2592 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 38,305 psi | 59% | 2523 fps | 96.1% |
| ADI AR 2217 | <<locked>> | 86% | 34,911 psi | 54% | 2441 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 98% | 45,992 psi | 71% | 2743 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 84% | 29,443 psi | 45% | 2343 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,545 psi | 76% | 2703 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,018 psi | 66% | 2585 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,754 psi | 60% | 2530 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,492 psi | 58% | 2487 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,329 psi | 50% | 2411 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,047 psi | 65% | 2631 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 46,630 psi | 72% | 2736 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 46,079 psi | 71% | 2615 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 36,071 psi | 56% | 2470 fps | 96.6% |
| Bofors RP30 | <<locked>> | 84% | 34,258 psi | 53% | 2451 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 38,754 psi | 60% | 2530 fps | 97.6% |
| Bofors RP7 | <<locked>> | 80% | 53,272 psi | 82% | 2697 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 33,127 psi | 51% | 2402 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 53,200 psi | 82% | 2746 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 40,944 psi | 63% | 2530 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,161 psi | 62% | 2513 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,456 psi | 71% | 2582 fps | 100% |
| Hodgdon Retumbo | 71.9 gr | 80% | 31,430 psi | 48% | 2431 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 53,766 psi | 83% | 2776 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,920 psi | 43% | 1594 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,820 psi | 75% | 2638 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,766 psi | 84% | 2717 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 48,805 psi | 75% | 2641 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,380 psi | 65% | 2530 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 37,057 psi | 57% | 2507 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 92% | 35,143 psi | 54% | 2490 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 52,185 psi | 80% | 2667 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,633 psi | 78% | 2664 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 33,098 psi | 51% | 2343 fps | 98.1% |
| Norma 204 | <<locked>> | 80% | 49,356 psi | 76% | 2680 fps | 99.4% |
| Norma 217 | <<locked>> | 88% | 30,603 psi | 47% | 2392 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 41,104 psi | 63% | 2598 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 50,314 psi | 77% | 2680 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 36,651 psi | 56% | 2507 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 80% | 49,313 psi | 76% | 2684 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 32,721 psi | 50% | 2392 fps | 96.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,631 psi | 44% | 1634 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,880 psi | 80% | 2717 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,343 psi | 77% | 2740 fps | 100% |
| ReloadSwiss RS 76 | 77 gr | 80% | 30,618 psi | 47% | 2405 fps | 96.4% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 40,596 psi | 62% | 2615 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 43,976 psi | 68% | 2566 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 80% | 42,337 psi | 65% | 2569 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 80% | 53,272 psi | 82% | 2697 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,185 psi | 80% | 2667 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,633 psi | 78% | 2664 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,068 psi | 79% | 2621 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,003 psi | 65% | 2566 fps | 98.4% |
| Somchem S361 | <<locked>> | 80% | 44,904 psi | 69% | 2552 fps | 97.4% |
| Somchem S365 | <<locked>> | 80% | 47,776 psi | 74% | 2635 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,743 psi | 66% | 2549 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 80% | 51,866 psi | 80% | 2674 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,275 psi | 57% | 2431 fps | 97.7% |
| Vihtavuori N170 | <<locked>> | 94% | 51,140 psi | 79% | 2694 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 51,039 psi | 79% | 2677 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,814 psi | 64% | 2559 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,046 psi | 63% | 2592 fps | 96.5% |
| Vihtavuori N565 | <<locked>> | 82% | 35,969 psi | 55% | 2464 fps | 95% |
| Vihtavuori N568 | <<locked>> | 90% | 41,901 psi | 64% | 2631 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 94% | 45,948 psi | 71% | 2740 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,227 psi | 79% | 2625 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,403 psi | 82% | 2749 fps | 100% |
| Winchester StaBALL HD | 73.9 gr | 80% | 34,635 psi | 53% | 2523 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,334 psi | 61% | 2480 fps | 97.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 72 powders for .300 Rem. Ultra Mag. loaded with the .308 | 193gr | Peregrine VLR-4. Vihtavuori N570 delivers the highest muzzle velocity at 2,933 fps; across all powders the maximum-charge window runs from 1,778 fps to 2,933 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 193.0 gr projectile in 0.308" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2218, ADI AR 2225 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Hodgdon Retumbo, ReloadSwiss RS 76, Winchester StaBALL HD rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 193gr | Peregrine VLR-4 they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.